Air compressor



FIG. 1 is a perspective view from above of an air compressor showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right elevational side view thereof; the left elevational side view is the same as the right side view; and,

FIG. 4. is a front elevational side view thereof; the back elevational side view is the same as the front side view.

The portions indicated with a broken line are for illustrative purposes only, and form no part of the claimed design.

The bottom view of the air compressor is not shown in the drawings and forms no part of the claimed design. 

The ornamental design for an air compressor, as shown and described. 